Changelog- ui sounds and background soundtrack of the temporary sounds provided by VRMLN- structures can now be built only on specific slot types

Next steps- some structure will be allowed to be built only if other structures are already built (e.g. Atmosphere structures can be built only if Launch station is already built)- start menu, with possibility to start game, change fx volume, change music volume- in-game menu: pause game, change fx volume, change music volume, return to game, return to start menu